afc.nn {afc}

2AFC For Nominal Polychotomous Observations And Nominal Polychotomous Forecasts

Description

Routine to calculate the Generalized Discrimination Score (aka Two-Alternatives Forced Choice Score 2AFC) for the situation of polychotomous observations (nominal) and polychotomous forecasts (nominal)

Usage

afc.nn(obsv, fcst, m = 3)

Arguments

obsv

vector with polychotomous observations (values in 1,..,m)

fcst

vector of same length as obsv with polychotomous forecasts (values in 1,..,m)

m

number of observation and forecast categories (default = 3)

Details

This routine applies Eq.15 of Mason and Weigel (2009) to calculate the 2AFC.

Value

p.afc

Value of Generalized Discrimination (2AFC) Score

Author(s)

Andreas Weigel, Federal Office of Meteorology and Climatology, MeteoSwiss, Zurich, Switzerland

References

S.J. Mason and A.P. Weigel, 2009. A generic verification framework for administrative purposes. Mon. Wea. Rev., 137, 331-349

See Also

afc

Examples

  #Forecasts and observations of Nino-3.4 index
  #Load set of polychotomous observations and polychotomous forecasts (4 categories)
  data(cnrm.nino34.mm)
  obsv = cnrm.nino34.mm$obsv
  fcst = cnrm.nino34.mm$fcst

  #Calculate skill score
  afc.nn(obsv,fcst,4)